While the cost of air-flights may seem high, but it is NOT unreachable to the few - bizmen, students, even down to the semi-skilled worker seeking better life... The power of ONE is an exponential number in maths, which when EXTRAPOLATED, it can even show billions of figures, not just in financial terms, but social terms...
Thus a market potential lays therein, as the famous saying here in SBF - can eat, don't waste.
2. This point here does not mean to insult or cast aspersions on Indians - whom are only are fellow Humans on Earth. It is just that they have a different culture, way of life that may seem incomprehensible to us or even to the rest of Humanity. If anyone is offended, the insignificant nobody me sincerely & humbly offer my apologies...
Try taking a flight to or from India where the passengers are mostly Indians, & one will understand what I mean.
Thus, it would make biz sense to SIA, to hire cabin crew from India, whom mostly would serve upon the India route, as they are brought up in Indian culture, & would have more compassionate understandings of their fellow citizens than local citizens, to PROVIDE THE LEVEL OF SERVICE that made SIA great since its inception...